"They needed Bruce Willis … and Willis may have needed them. There may have been a sincere effort..."

"... on the part of his agents and managers to keep him busy and engaged, as a way to delay the worst of what his disease would eventually bring. However, at a certain point, most likely sometime in the last two years if reports are correct, a health line seems to have been crossed. But the work continued." 

Writes Joe Ferullo in "Hollywood failed Bruce Willis" (The Hill). 

Willis made 21 movies in the last 4 years.

Directors were asked to keep the star’s dialogue short and his days on set to a minimum. Even that reportedly was sometimes challenging for the actor. Despite all this, film roles kept coming.... The majority were low budget efforts, often $10 million or less, compared to an average $65 million budget for a mainstream studio production. The movies were typically violent action stories that sell well internationally.... Independent producers — working outside the big studio system — have to raise the money on their own for these films. The most important sales tool they have is the movie’s poster.... It’s far easier to get backing if your poster includes the face of a well-known actor....

There's an old term: "exploitation film."

An exploitation film is a film that attempts to succeed financially by exploiting current trends, niche genres, or lurid content. Exploitation films are generally low-quality "B movies"....

Here, it seems, an actor was exploited in the making of exploitation films. From his Wikipedia page: 

In the later years of his career, Willis starred in numerous low-budget independent films that were panned by critics; he would often earn $2 million for two days of work per film. Those working with Willis noted that he appeared confused, did not understand why he was there and had to be fed lines through an earpiece. Days before Willis was scheduled to arrive on set for one film, Out of Death, the screenwriter was instructed to reduce his role and abbreviate his dialogue. The Golden Raspberry Awards, an annual award for the year's worst films and performances, created a dedicated category, the Worst Bruce Willis Performance in a 2021 Movie, for his roles in eight films released that years. 

Or do you think he benefited from keeping busy and that he must have wanted his family to take in the last few millions that could be squeezed from his face.